fix(profiles): add winter_road/ice_road and surface=ice/snow to car.lua (#7465)

* fix(profiles): add winter_road/ice_road and surface=ice/snow to car.lua

OSM highway=winter_road, highway=ice_road, surface=ice, and surface=snow
had no entries in car.lua. OSRM was routing over these ways at full highway
speed, producing dangerously optimistic routes in winter conditions.

Add conservative speed caps consistent with safe winter driving:
- speeds.highway: winter_road=20, ice_road=15 (km/h)
- surface_speeds: ice=20, snow=30 (km/h)

WayHandlers.speed() and WayHandlers.surface() already read these tables;
no logic changes required.

Fixes #7464

Co-Authored-By: Claude and aki1770-del <aki1770@gmail.com>

* test(profiles): add cucumber tests for winter_road/ice_road and surface=ice/snow

Co-Authored-By: Claude and aki1770-del <aki1770@gmail.com>

---------

Co-authored-by: Dennis Luxen <info@project-osrm.org>

Author: aki1770-del

features/car/speed.feature

@@ -23,6 +23,8 @@ Feature: Car - speeds
             | residential    | no     | 25 km/h |
             | living_street  | no     | 10 km/h  |
             | service        | no     | 15 km/h |
+            | winter_road    | no     | 20 km/h |
+            | ice_road       | no     | 15 km/h |
 
     # Alternating oneways scale rates but not speeds
     Scenario: Car - scaled speeds for oneway=alternating

features/car/surface.feature

@@ -33,6 +33,8 @@ Feature: Car - Surfaces
             | trunk   | asphalt  | x     |
             | trunk   | sett     | x     |
             | trunk   | gravel   | x     |
+            | trunk   | ice      | x     |
+            | trunk   | snow     | x     |
             | trunk   | nonsense | x     |
 
     Scenario: Car - Good surfaces should not grant access
@@ -93,6 +95,8 @@ Feature: Car - Surfaces
             | motorway | no     | rocky           | 20 km/h +-1 | 20 km/h +-1 |
             | motorway | no     | sand            | 20 km/h +-1 | 20 km/h +-1 |
             | motorway | no     | mud             | 10 km/h +-1 | 10 km/h +-1 |
+            | motorway | no     | ice             | 20 km/h +-1 | 20 km/h +-1 |
+            | motorway | no     | snow            | 30 km/h +-1 | 30 km/h +-1 |
 
     Scenario: Car - Tracktypes should reduce speed
         Then routability should be

profiles/car.lua

@@ -163,7 +163,10 @@ function setup()
         unclassified    = 25,
         residential     = 25,
         living_street   = 10,
-        service         = 15
+        service         = 15,
+        -- winter highway types (OSM highway=winter_road / highway=ice_road)
+        winter_road     = 20,
+        ice_road        = 15
       }
     },
 
@@ -251,7 +254,11 @@ function setup()
       rocky = 20,
       sand = 20,
 
-      mud = 10
+      mud = 10,
+
+      -- winter surfaces (OSM surface=ice / surface=snow)
+      ice  = 20,
+      snow = 30
     },
 
     -- max speed for tracktypes